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JOSEPH A. MILLER, or NEW YORK, N. Y.

Letter'8,Patent No. 63,923, lated April 16, 186i'.

IMPROVEMENT IN ,STEAM GENERATORS.

To ALL WHoM IT MAY ooNoEEN:

Be it known that I, JOSEPH A.' MILLER, of the city, county, and State ofNew `York, have invented a certain new and usefullmprovement in SteamBoilers, of which the following is a full, clear, and exact description,reference being hadrito the accompanying drawing, marked C, formingpart-ofthis specification, and in which- Y Figure 1 represents avertical section of a boiler constructed according to my improvement,taken through the line n n in fig. 2. Y

Figure 2, a horizontal section thereof, through the line wr w in fig. l;and

Figure 3, a similar View, through the line y y in g. 1.'

Like letters indicate like parts throughout the several gures. v

The nature of the invention includes an annular or other shaped waterbase arranged below the grate, and having mounted upon and incommunication with it an inner and outer row or series of Water tubes,the inner row being the smaller of the two, and being in communicationat their tops with a hollow dome or root` to the fire situated within acylinder or space, and the outer shell of which dome is open at the topat or about the water level to the steam space of said cylinder, whichhas smoke tubes connected with it, -the stack running up through it, andis connected at its bottom with the Water base by the larger and outerrow of' pipes surroundingthe Jdre-box, and that form return-waterspaces, while the inner and smaller row of pipes and hollow dome con Lstitute isolated sheet or thin -Water spaces and steam generatorsproper.

Referring to the accompanying drawing, the boiler, which is representedas of vertical cylindrical character,

has arranged below the level of its grate, A2, a water base, B2, whichmay be ofannular form, and has mounted onv and connecting with it aninner and outer row of vertical water. tubes, O2 Dz, the inner ones, C2,being smaller than the outer ones, and forming sides and back to thelire-chamber'Ezl Said small tubes, C2, communicate at their tops with awater-jacket or space,l,r]2, of a conical or othersuitably-'shapedre-hox roof, F2, arranged to project upwardly within anurpcr chamber or cylinder, G2, to thewalter le'vel. This Water-jacket orspace g2 and tubes C2 form iilm or thin isolated water spaces andisteamgenerator proper, upon which the re is made to act direct to theexclusion of the. remaining or main body 'of water in the boiler,whichremaining body or portion is con-y tained withiuthe cylinder (i2 iuthe space surrounding the water-jacket gzand Within the return-watertubes D that connect the cylinder Gj at its bottom with the Water baseThe-steam generated i-n the isolated Water 'spaces G2 and g2 has a readyand free escape without passing through a superincumbent body of waterinto the steam space in the upper portionof the cylinder GJ, and roundor over-a detlecting plate, h2, in -to a steam dome, H2, while any watercarried over the Waterjacket g2 by the steam serves to keep up4a'eirculation by its return or dow Qf water down lthe return tubes D'3into the Water base B'L below the grate., The smoke and gaseous productspass oif from the re-chamber E2 up smoke -tubes I2 in the, cylindenGr'linto a smoke-box, J2, sui`-` rounding the steam dome and oil' up thestack K2. I

By this construction and arrangement most or/all of the heat is utihzed.If desired, the water space may be continued by en annular cylinder`surrounding the return pipes l)2 from thecylinder Gr2 to the water baseB below, andthe boiler be suitably built u'p `in outer brick-Work; or,which admits of more freedom foil expansion oil-the several parts, itmay be suspended' at its upper part by4 knees, "i", on a lower brick orother support, as represented in fig. 1. l

What I claim as my invention, and desire to secure by Letters Patent,is-.`

The combination of the waterl base B2, grate A2, steam-generating tubesC2, and jacket g'f, to the tire-bor; roof F2, cylinder or upper chamberG", return-water -pipes D2, and smoke tubes I2, the whole being arrangedrelatively to each other substahtially as specified. A.

JOSEPH A. MILD-ER.

v'liiitn'essesr J, W. GooiuBs, A. LE CLI-uro. V

